net: platform-dependent default socket options
This CL revises existing platform-dependent default socket
options to make it possible to accomodate multiple multicast
datagram listeners on a single service port.
Also removes unnecessary SO_REUSEADDR, SO_REUSEPORT socket
options from unicast datagram sockets by default.
Fixes #1692.
R=devon.odell, alex.brainman, rsc
CC=golang-dev
https://golang.org/cl/5538052
diff --git a/src/pkg/net/multicast_test.go b/src/pkg/net/multicast_test.go
index 96bac45..183d5a8 100644
--- a/src/pkg/net/multicast_test.go
+++ b/src/pkg/net/multicast_test.go
@@ -95,6 +95,49 @@
}
}
+func TestSimpleMulticastUDP(t *testing.T) {
+ if runtime.GOOS == "plan9" {
+ return
+ }
+ if !*multicast {
+ t.Logf("test disabled; use --multicast to enable")
+ return
+ }
+
+ for _, tt := range multicastUDPTests {
+ var ifi *Interface
+ if tt.ipv6 {
+ continue
+ }
+ tt.flags = FlagUp | FlagMulticast
+ ift, err := Interfaces()
+ if err != nil {
+ t.Fatalf("Interfaces failed: %v", err)
+ }
+ for _, x := range ift {
+ if x.Flags&tt.flags == tt.flags {
+ ifi = &x
+ break
+ }
+ }
+ if ifi == nil {
+ t.Logf("an appropriate multicast interface not found")
+ return
+ }
+ c, err := ListenUDP(tt.net, &UDPAddr{IP: tt.laddr})
+ if err != nil {
+ t.Fatalf("ListenUDP failed: %v", err)
+ }
+ defer c.Close()
+ if err := c.JoinGroup(ifi, tt.gaddr); err != nil {
+ t.Fatalf("JoinGroup failed: %v", err)
+ }
+ if err := c.LeaveGroup(ifi, tt.gaddr); err != nil {
+ t.Fatalf("LeaveGroup failed: %v", err)
+ }
+ }
+}
+
func testIPv4MulticastSocketOptions(t *testing.T, fd *netFD, ifi *Interface) {
ifmc, err := ipv4MulticastInterface(fd)
if err != nil {
